Method in polishing sheet metal.



No. 819,369. PATEN'TED MAY 1, 1906. J. NELSON.

METHOD IN POLISHING SHEET METAL. APPLIGATION FILED 0019,1905.

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented May 1, 1906.

Original application filed April 22, 1905, Serial No. 255,938. Dividedand this application filed October 9, 1905. Serial No- 281,914.

To all whom it may concern:

Be it known that I, JOHN NELSON, a citizen of the United States,residing at Peru, in l the county of Lasalle and State of Illinois, haveinvented a new and useful Improvement in Methods in Polishing SheetMetal, of which the following is a specification.

My invention relates particularly to a method of feeding metal sheetsthrough a polishing-machine whereby the sheets are prevented from beingviolently thrown from the machine owing to the action of the polishingor bufling cylinder.

In the accompanying drawing so much of a polishing-machine is shown aswill enable my invention to be readily explained and understood, and fora fuller description of said machine reference is made to my pendingapplication, Serial No. 255,938, filed April 22, 1905, of which thepresent application forms a division.

Referringto the drawing, A represents a portion of a frame having sidestandards A A B, a sheet supporting and feeding cylinder supported onthe side standards in any suitable manner, preferably as shown in saidapplication; B a relatively small feed-roll driven from any suitablesource of power and located in close relation to the cylinder B, and C apolishing or buffing roll located above and slightly in the rear of thecylinder B, so that the feed-roll B is located in the entrant anglebetween the cylinder B and roll C and close to the line of contacttherebetween.

The sheets of metal D D are fed between the rolls B B from a table D andthey then pass between the rolls B and C. The three rolls rotate in thedirection indicated by the arrows, and the roll C is given a very highspeed from any suitable source of power.

The method of feeding the sheets to secure the desired result is tocause the entering margin of the second sheet to overlap the rear marginof the first sheet sufliciently to span the distance between thecontact-lines formed by the cylinder B with the rolls B and 0, s01 thatthe rear margin of the first sheet is subjected to the binding action ofthe second sheet, thus leaving the sheet being operated upon at no timewholly free to the unrestrained action of the polishing-roll. It isunderstood, of course, that the process is repeated constantly as thesheets pass in succession through the machine.

It will be observed that the method of feeding described leaves a marginof each sheet unpolished, and this defect is remedied by turningthesheets end for end (keeping the polished side up) and feeding them againthrough the machine. This insures thorough cleansing and polishing ofthe sheets, inasmuch as any cavities or protected surfaces escaping thepolishing-roll when applied to the sheet when presented in one directionare exposed to polishing action when the sheet is'presented in theopposite direction.

What I regard as new, and desire to secure by Letters Patent, is

1. The method of feeding sheets of metal through a polishing-machine,which consists in overlapping the sheets, whereby the leaving sheet issubjected to the binding action of the following sheet to prevent theformer from being violently thrown by the action of thepolishing-cylinder, for the purpose set forth.

2. The'method of polishing sheets of metal, which consists in passingthe sheets in overlapping condition between a supporting-roll andjuxtaposed feed and polishing rolls co-- acting therewith and thenreversing the sheets (without inversion) and passing them in overlappingcondition between the supporting-roll and the feed and olishing rolls,whereby an entire surface of each sheet is polished and the sheetspreserved from being violently thrown from the machine by thepolishing-roll.

' JOHN NELSON. In presence of R. F. STRUEVER, B. J. WAUMAN.

